algebra1 HELP PLEASE
posted by lisa .
The height in feet of a rocket after t seconds is given by h(t) = 160t  16t2.
Find the maximum height the rocket attains:
After how many seconds does it reach this height?

by now you know about parabolas.
h(t) = 160t  16t^2
the vertex of a parabola is at t = b/2a, which here is
t = 160/32 = 5
So, at t=5, h(t) = 400